It is narrated from Sayyiduna Ma'mar bin Abdullah bin Nadlah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "No one hoards except a sinner."
Muhammad (bin Ishaq) said: Sa'id (bin al-Musayyab) also used to hoard, and Ma'mar also used to hoard.
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 18211